154550989 has 2 divisors, whose sum is σ = 154550990. Its totient is φ = 154550988.

The previous prime is 154550983. The next prime is 154551011. The reversal of 154550989 is 989055451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147816964 + 6734025 = 12158^2 + 2595^2 .

It is a cyclic number.

It is not a de Polignac number, because 154550989 - 2⁹ = 154550477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154550983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77275494 + 77275495.

It is an arithmetic number, because the mean of its divisors is an integer number (77275495).

Almost surely, 2^154550989 is an apocalyptic number.

It is an amenable number.

154550989 is a deficient number, since it is larger than the sum of its proper divisors (1).

154550989 is an equidigital number, since it uses as much as digits as its factorization.

154550989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 46.

The square root of 154550989 is about 12431.8538038379. The cubic root of 154550989 is about 536.6493358000.

The spelling of 154550989 in words is "one hundred fifty-four million, five hundred fifty thousand, nine hundred eighty-nine".